Anchoring device

ABSTRACT

An improved anchor is provided by a single piece that is preshaped to define both an expander and sleeve positioned in endwise relation to each other and interconnected through a connection that is shearable upon bottoming the sleeve on the bottom wall of an aperture and then sharply striking the distal end of the expander to shear said connection and simultaneously telescope the expander into the sleeve. The portion of the sleeve adjacent the shearable connection may be thinned for easier rupture and a portion of the sleeve may be slotted for ease in expansion.

United States Patent Inventor Charles S. Lebar Woodcreek Road & Rte. 63,Barrington Hills, 111. 60010 Appl. No 797,408 Filed Feb. 7, 1969Patented Mar. 2, 1971 ANCHORING DEVICE 2 Claims, 6 Drawing Figs.

U.S. Cl 85/72, 85/73 Int. Cl Fl6b 13/06 Field of Search 85/73, 74; 85/72References Cited UNITED STATES PATENTS 1,755,204 4/1930 Mirzan 85/742,102,230 12/1937 Waterman 85/72 2,252,316 4/1941 Gelpcke 85/743,216,304 11/1965 James et a1. 1. 85/72 3,465,637 9/1969 Cushman et a1.85/72 3,493,254 2/1970 Summerlin et al 85/72 Primary Examiner-Edward CAllen AttorneyN0rman Lettvin Patented March 2, 1971 3,566,739

INVENTOR. CHARLES s. LEE/4R 9 2 ATTORNEYS ANCHORING DEVICE BACKGROUND OFTHE INVENTION This invention relates to an improved anchor for blindholes.

An object of this invention is to provide in a single piece, and as aconvenience for storage and use, both the expander and sleeve parts ofan expander type anchor, and to interconnect those parts through ashearable connection, so that upon positioning of the device in abottomed blind hold and by striking the exposed end of the device, thetwo portions of the device telescope with the expander positioned in thesleeve.

Another object of this invention is to provide an improved anchor, andmore particularly an improved sleeve for an anchor, for use in blindholes.

A further object is to provide an improved anchor for blind holes thatis characterized by inexpensiveness and simplicity of construction andby improved convenience in use.

Further objects and advantages of this invention will become apparent asthe following description proceeds and the features of novelty whichcharacterize this invention will be pointed out with particularity inthe claims annexed to and forming part of this specification.

A preferred embodiment of the invention is shown in the ac companyingdrawing.

BRIEF DESCRIPTION OF TIIE DRAWING FIG. 1 is a side elevation view of ananchor device embodying the invention;

FIG. 2 is a longitudinal cross section of the device of FIG. 1;

FIG. 3 is a fragmentary longitudinal cross section view of a blind holein concrete showing the environment where the invention is to be used;

FIG. 4 is similar to FIG. 3 but shows a modified from of the device ofFIG. 1 positioned in the blind hole;

FIG. 5 illustrates in cross section how the sections of the device ofFIG. 1 are telescoped after first being positioned as illustrated inFIG. 4; and

FIG. 6 illustrates the anchor of FIG. 1 when its sleeve is fullyexpanded in the environment seen in FIGS. 3--5.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing,one form of the invention herein is shown in FIGS. 1 and 2 as acombination device illustrated generally at 10 and consisting of anelongated expander 12 and an elongated sleeve 14 spaced longitudinallyof each other at an axially aligned attitude. As best seen in FIG. 2,the expander 12 is annular and has a frustoconical exterior 12a thattapers along the length of expander 12 from a reduced entry tip 12b toan enlarged end 12c located at one terminus of the device 10. The boreof expander 12 is threaded at 12a to provide for the customaryconnection thereto. The sleeve 14 has one end 14a at one terminus of thedevice 10, a second end 14b intermediate the ends of device 10, and acylindrical bore 140 longitudinally therethrough. The bore 140 has adiameter that is intermediate in size between the diameter dimensions ofends 12a and 12b of the expander.

FIGS. 3 and 4 illustrate generally the environment in which acombination device 10 of the type in FIGS. 1 and 2 is to be used. Thereis shown a concrete body C with a blind hole 16 therein. FIG. 4 showsthat the length and diameter of blind hole 16 are each slightly greaterthan the corresponding dimensions of the sleeve 14, so that when theconnector .seen in FIGS. 1 and are maintained in that condition, forconvenience in storage and for sale, by means of a shearable connection20 at the juxtaposed ends of the two sections. The shearable connection20 is a thin annular wall that is formed integrally with and extendsbetween the tip 12b of the expander and the end 14b of the sleeve, i.e.,radially outwardly of tip 12b and radially inwardly of end 14b with thewedging end of the expander immediately .adjacent one end of the sleeveso that the small diameter end 12b of the expander is positionedimmediately adjacent the larger diameter bore 14c of the sleeve.

The shearable connection is a very thin piece of metal such that whenthe combination device 10 is positioned as in FIG. 4, then by simplystriking end 14a of the sleeve sharply with a hammer, as illustrated inFIG. 5, the connection 20 readily shears to permit telescoping entry ofthe wedging tip 12b of the expander into the sleeve 14. Further drivingaction by the hammer moves the sleeve 14 into the hole 16 causing thesleeve 14 to move over the expander 12, while simultaneously expandingthe sleeve 14 outwardly into tightly gripping engagement with theinterior cylindrical periphery of the bore 16.

To facilitate the ready expansion of the sleeve 14 into grippingengagement, the portion of the sleeve immediately adjacent the shearableconnection 20 is formed with a frustoconical exterior portion 14d,thereby thinning the annular wall of the sleeve adjacent the end 14b. Asthe expander 12 moves relatively further into the sleeve 14, the thinnedwall portion, adjacent said end of the sleeve, stretches and evenruptures as indicated at 24. The telescoping movement of sleeve 14relative to expander 12 continues until the end 14a of the sleeve islocated at a position substantially coplanar with surface of the body C,as seen for example in FIG. 6.

In a modified form of device as shown in FIG. 4, the cylindrical portionof the sleeve 14, from whence the thinned or tapered portion 22' extendsand which is distal from the expander 12, is provided with alongitudinal slot 26 therein completely through the wall so that asfurther telescoping occurs between sleeve 14 and expander 12, the saidcylindrical portion 14' is more easily expanded into gripping engagementwith the cylindrical wall of the bore 16.

In both forms of device, as in FIGS. 1 and 2 and in FIG. 4, the expander12, sleeve 14 and shearable connection 20 are formed integrally of anyappropriate material such as selected steels that permits all of theactions demanded. The arrangement of parts insures that there is alwaysone sleeve for each expander and telescoping is insured by the axialalignment of the parts.

It will be understood that a device such as at 10 in FIGS. 1 and 2 maybe readily produced by automatic machines and that, too, is a desirablefeature. Where a slot is to be added as at 26 in the form of device ofFIG. 4, the device is first formed on automatic machines without theslot, and the devices may then be fed automatically by hopper so as tobe aligned and slotted. As an additional feature, a portion of thefrustoconical wall 12a of either form of device may be provided with aknurl as indicated in the position of 28 in FIG. 4 which will engage theinner cylindrical wall of the sleeve for preventing relative rotation ofthe expander 12 when a bolt is being rotated in the threads 12d of theexpander.

It will be obvious to those skilled in the art that other changes andmodifications may be made in the invention without departing therefromand, therefore, it is intended in the appended claims to cover all suchchanges and modifications as fall within the true spirit and scope ofthe invention.

Iclaim:

1. In an elongated anchor device of the type including an expanderportion, having a circumferentially continuous and uninterruptedfrustoconical exterior for telescoping into an end of a sleeve andsecured at its reduced end by a shearable connection to an expandablesleeve member; the improvement comprising the said sleeve member havingan inner cylindrical surface and being shaped exteriorly to provide acylindrical section spaced from the said reduced end of the expander byan intervening frustoconical, thinned, section, said frustoconical,thinned section having a circumferentially continuous and uninterruptedinner cylindrical periphery and a circumferentially continuous anduninterrupted frustoconical outer periphery, and said cylindricalsection of the sleeve being slotted along its length through thethickness of the sleeve wall to provide for ease of expansion of saidcylindrical portion of the sleeve member.

2. In an elongated anchor device of the type including an expanderportion, having a circumferentially continuous and uninterruptedfrustoconical exterior for telescoping into an end of a sleeve andsecured at its reduced end by a shearable connection to an expandablesleeve member; the improvement comprising the said sleeve member havingan inner cylindrical surface and being shaped exteriorly to provide acylindrical section spaced from the said reduced end of the expander byan intervening frustoconical, thinned, section, said frustoconical,thinned section having a circumferentially continuous and uninterruptedinner cylindrical periphery and a circumferentially continuous anduninterrupted frustoconical outer periphery, and said cylindricalsection of the sleeve being slotted along its length through thethickness of the sleeve wall to provide for ease of expansion of saidcylindrical portion of the sleeve member, and the frustoconical exteriorof the expander portion providing two bands of circumferentiallycontinuous and uninterrupted surface spaced apart by a circumferentiallycontinuous band of knurling that is adapted for increased grippingengagement with the inner surface of the sleeve member, when theexpander portion is telescoped into the sleeve, to prevent relativerotation between the expander and the sleeve.

1. In an elongated anchor device of the type including an expanderportion, having a circumferentially continuous and uninterruptedfrustoconical exterior for telescoping into an end of a sleeve andsecured at its reduced end by a shearable connection to an expandablesleeve member; the improvement comprising the said sleeve member havingan inner cylindrical surface and being shaped exteriorly to provide acylindrical section spaced from the said reduced end of the expander byan intervening frustoconical, thinned, section, said frustoconical,thinned section having a circumferentially continuous and uninterruptedinner cylindrical periphery and a circumferentially continuous anduninterrupted frustoconical outer periphery, and said cylindricalsection of the sleeve being slotted along its length through thethickness of the sleeve wall to provide for ease of expansion of saidcylindrical portion of the sleeve member.
 2. In an elongated anchordevice of the type including an expander portion, having acircumferentially continuous and uninterrupted frustoconical exteriorfor telescoping into an end of a sleeve and secured at its reduced endby a shearable connection to an expandable sleeve member; theimprovement comprising the said sleeve member having an innercylindrical surface and being shaped exteriorly to provide a cylindricalsection spaced from the said reduced end of the expander by anintervening frustoconical, thinned, section, said frustoconical, thinnedsection having a circumferentially continuous and uninterrupted innercylindrical periphery and a circumferentially continuous anduninterrupted frustoconical outer periphery, and said cylindricalsection of the sleeve being slotted along its length through thethickness of the sleeve wall to provide for ease of expansion of saidcylindrical portion of the sleeve member, and the frustoconical exteriorof the expander portion providing two bands of circumferentiallycontinuous and uninterrupted surface spaced apart by a circumferentiallycontinuous band of knurling that is adapted for increased grippingengagement with the inner surface of the sleeve member, when theexpander portion is telescoped into the sleeve, to prevent relativerotation between the expander and the sleeve.